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Merge branch 'dev' of https://github.com/brettwooldridge/HikariCP into dev

* 'dev' of https://github.com/brettwooldridge/HikariCP:
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Fixed #67 mbean UN-registration
Attempt to fix spurious test failures due to timing sensitivities.
Fix #68 correct JavaDoc for HikariConfig.getConnectionTimeout()/setConnectionTimeout().
Remove compile warning about unused import by fully qualifying the class in the JavaDoc instead.
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Add additional warning.
Make some fields final.
Fix #74 add pool name to housekeeping timer thread
Performance optimizations.
Performance enhancements.
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Fix #76 add more extensive shutdown() code to attempt to close() or abort() all connections in the pool.